I'd like to have access to the lines/tracebacks/whatever whispered by the kernel right before dying. This has proven problematic, because all interfaces I have access to become disabled. Post-reboot, systemd journal has not been able to record anything about the crash, probably because flushing buffers to filesystem is blocked.
Here's what I've tried and failed with
console access - X application runs here for dayjob, but after system has crashed, no keyboard input is recognized, so I can't switch to vt
netconsolesending data to
nclistening on another machine - I expected this to work, but while everything else shows up, no crash-related kernel tracebacks get there, not even with
dmesg -n 8
sshvia network - impossible after the crash, because network gets blocked off, too
What other option do I have to capture 100% everything? Perhaps serial console? (what would be a suitable device) I think anything with USB is susceptible to also getting the subsystem blocked off.
Note: This box is local, sitting in my room, so all access and methods are available.